Combustion control



April 14, 1931.

T. A. PEEBLES COMBUSTION CONTROL Filed June 13, 1929 ii I avE NO-n ara Patented Apr. 14, 1931 N'rs sfirA'r az s THOMAS A. PEEBLES; Y Y i Horwoon, or DORIVIO COMBUSTION oon'rnon Application filed. June is,

This invention relates to improvements in regulating devices such, for example, as pressure operated regulators commonly employed v in connection with boiler furnaces or the like. 7 k i One well known form of such regulator includes as a part of the operating mechanism a balanced lever havingan inverted bell secured to each end thereof, the lower open mouths of the bells being located below the surface of a sealing'liquid contained in an associated tank. Pressure taps connect the interior of one orboth bells'with the associated apparatus which is subject to the presisure variations by and in accordance with which the regulator isactuated. It has been 'found in practice that, as a result of this arrangement, any sudden or relatively large change in pressure which is transmitted di- 1' rectlyto, one ofthe bells causes the lever to 1 39 and arranged so as to obviate this defect.

Another object of this invention is to pro- .duce a pressure responsive mechanism which canfbe regulated and adapted to use on any type of furnace regardless of the degree of pressure variations encountered,

These and other objects which will be apparent to those skilled in the art are accomplished by means ofthe invention illustrated in the accompanying drawing inwhich Fig.

1E. is a transverse sectional view of a well known type of regulatorconstructed, in accordance with one embodiment of this invention.

- The particular form of the invention which has been chosen for illustration is shown in connection with a regulator'ofthe type described and claimediin Letters Patent No. 11,338,923, dated May a, 1920, to J. M.'H0pwood,-havinga balanced lever 1 provided at each end'with'in'vertedbells 2 and 3 immersed I 1trated embodiment connected with the athas passed out through the orifice. By regu- PN U OF MOUNT LEBANON, PENNSYLVANIA, ASSTGNOR TO JOHN M NT, PENNSYLVANIA to a suitable extent in a fluid'contained in a tank 4, havinga movable cover 11. A pressure'tap 12 projects into one of the inverted bells, as 2, and theother'bell 3 is in the illus- 1929. Serial No. 370,525.

mosphere by tap 14. i As the lower ends of the bells are sealed by the fluid any changes of pressure will cause correspondingshifting of the lever 1. An arm 15 secured to lever 1 connects the lever with'the vertically movable frame whlch 1s connected to the associated apparatus in the, usual manner. Any

sudden or relatively large change in pressure transmitted to the bell 2 causes'the' lever 1 to be shlfted' beyond the point which it would normally assume as a resultof such pressure change, thereby causingthe lever to momentarily oscillate back and forth.

The present invention provides an ar rangement. "for eliminating this so-called hunting of the regulator by theaddition of certainmechanisms'to the bells which includes partially closed chambers 5 and 6 whichjlpartially close the openings of the bells. The chambers 5 and6 have orifices 7 and 8 to permit the fluid in .the tank to flow into said'chambers andthreaded needle valves 9 and lO fitting. into the orifices to] regulate the rapidity with whichthe fluid may pass therethrough. Any pressure "change in the bell, through the pressure tap, will cause one hell to be raised and'the other to be lowered. The bellbeing raised is retarded in its upward movement until the fluid in the chamber lating the needle valve in the orifice the degree of retarding influence of the chamber.

can be controlled. Theother bell acts as a dash pot or draguntil the fluid in the cham- .ber has attained the level of the fluid in the seen that an. even movementof the lever can be secured whether the pressure changes are rapid and sharply defined or slow and uniform.

In the operation of the regulator, the lever I l is in equilibrium and the internal pressure in the bell 2 is equal to the pressure in the line '12. The bell 3 has internal pressure equal to the atmosphere. If thepressurein the line 12 is increased, the bell 2' will move upwardly and since the lever is in equilibrium there is no resistance to the. initial upward.

movement. However, as the upward movement continues, the liquid in the chamber 5 is raised imposing an increasing resistance to further upwards-movement. \Vhen the level of the liquid in the chamber 5 rises above the level of theliquid in the tank 4, the liquid tends 'to flowoutof the orifice 7 thereby decreasing the resistance to further upward movement in accordance with the time elapsed since the movement started. As the hell 2 is raised, the bell 3 on the opposite end of the lever 1 is forced downwardly into the liquid inthetank 4 and furtherresists the moving of the lever 1 out of equilibrium. As the bell 3 is lowered, the level of the liquid in chamber 6 goes below the level of the liquid in the tank 4. The liquid in thetank tends to flow into the chamber 6 through the orifice 8 and decreases the resistance to further movement of the lever 1 as the liquid in the chamber approaches the level of the liquid in the tank and the lever l is again in equilibrium. By making the orifices 7 and '8 in the bellv chambers the same size the amount of resistance to further movement of the lever cairbe controlledas can the timeinwhichthe liquid in the chambers acts as retarding factors to-themovement thereof.

Having now described my invention what 'I claim as new and desire to secure .by Letters since the movement started.

2. .The combination in a pressure responsive mechanism, of afluid tank, a balanced leverprovided with inverted 'bells extending into thefluid in said tank, a fluid chamber partially closing-the end of eachof said bells, an orifice in eachof said chambers for permitti'ngthe liquid in said tank to: flow into arrdbut of "the chambers, andi a'valve ferrestricting said orifices."

The combination in: apressure -respon-- -siverrieelraniemg having a fluid tankqandia ratus conrprisin'g in,combination-"a:fli

balanced lever provided with inverted bells extending into the fluid of said tank, means for resisting the movement of said lever out of equilibrium including fluid receiving chambers artiall ClOSlII the ends of said bells havingrestricted orifices therein for permitting the liquid in said tank to flow into and out of said chambers so that the resistance to movement of said lever increases in accordance with the extentfof'movement and decreases as the time since the movement started increases. 7 I

l. A pressure responsive regulating apparatus comprising a fluid tank, a balanced lever having inverted bells extending into the fluid in said tank, pressure pipes leading to said bells and means for resistinginovement of said lever'out of equilibrium, said means including fluid chambers partially closing the opening of said bells and restricted orifices in said chambers for permitting communication between said tank and said chambeisso that on variation of the pressure in one of said bells the fluid in one chamber acts as a weight resisting movement and the fluid in the other bella'cts as a drag to resist said movement.

- 5. A pressure responsive regulating apparatus comprising in combination a fluid tank, abalanced lever having inverted bells ex tending into the fiuid of saidtank, means for introducinga variable pressure to one of said bells, fluid chambers partially closing the mouth of each of said bells having openings communicating, with said, tank and meansassociatedfwith said chambers for reestablishing theequilibrium'of said lever after a pressure variation in one of 'saidbells.

6, pressure responsive regulating-apparatus comprising in combination a fluiditank, balanced lever having inverted bells extending into the fluid of said tank, fluid 'chambers partially closing the opening of said bells, said chambers having restricted orifices therein communicating with said tank, means for introducing a variable pressure to one of said bells and means forrestricting the flowof liquid into-and out of said fluid chambers for reestablishingv the equilibrium of said lever after a pressure varia tion in one of said bells.

7 A pressureresponsive regulating apparatus comprising in combinationa fluid tank, a lever having inverted bells extending into the fluid of said tank, said lever being in equilibrium with one of said bells, m'eansfor introducing a variable pressure to one offsaid bells, fluid chambers partially closing; the mouth of each'of said bells having openings therein communicatingwith saidtank and means associated with said chambers for'reestablishing the equilibrium: of saidifleyer after a:-pressure variation-in one of'said'ibell's.

8. Apressure responsive regulatin' appaa lever having inverted bells extending into the fluid of said tank, said lever being in equilibrium with one of said bells, fluid chambers partially closing the opening of said bells, said chambers having restricted orifices therein communicating With said tank and means for introducing a variable pressure to one of said bells and means for restricting the flow of liquid into and out of said fluid chambers for reestablishing the equilibrium of said lever after a pressure variation in one of said bells.

In testimony whereof, I have hereunto subscribed my name this 11th day of June, 1929.

THOMAS A. PEEBLES. 

